I'm just getting into reloading and am working up loads for 5.56 nato using H335 and a 62 grain bullet. I've reached the maximum charge shown in the Hornady manual, but the velocity is 200 fps below that shown in the manual. Is there something I'm missing? I spoke to someone who said the Hornady manual was super conservative, but that doesn't seem like it would explain why my velocity is so low at the maximum charge weight.